<template>
  <view v-if="goods_info.goods_name" class="goods-detail-container">
    <!-- 轮播图区域 -->
   <swiper :indicator-dots="true" :autoplay="true" :interval="3000" :duration="1000" :circular="true">
      <swiper-item v-for="(item,i) in goods_info.pics" :key="i" >
          <image :src="item.pics_big" @click="preview(i)"></image>
      </swiper-item>
    </swiper>
    <!-- 商品信息区域 -->
    <view class="goods-info-box">
      <!-- 商品价格 -->
      <view class="price">￥{{goods_info.goods_price}}</view>
      <!-- 商品信息主题区域 -->
      <view class="goods-info-body">
        <!-- 商品名称 -->
        <view class="goods-name">{{goods_info.goods_name}}</view>
        <!-- 收藏 -->
        <view class="favi">
          <uni-icons type="star" size="18" clolr="gray"></uni-icons>
          <text>收藏</text>
        </view>
      </view>
      <!-- 运费 -->
      <view class="yf">快递:免运费</view>
    </view>
    <!-- 主题图文富文本渲染 -->
    <rich-text :nodes="goods_info.goods_introduce"></rich-text>
    <!-- 商品导航组件区域 -->
    <view class="goods_nav">
      <uni-goods-nav :fill="true"  :options="options" :buttonGroup="buttonGroup"  @click="onClick" @buttonClick="buttonClick" />
    </view>
  </view>
</template>

<script>
  import { mapState, mapMutations, mapGetters } from 'vuex'
  export default {
    computed:{
      ...mapState('m_cart', ['cart']),
      ...mapGetters('m_cart', ['total'])
    },
    watch:{
      // 1. 监听 total 值的变化，通过第一个形参得到变化后的新值
      // total(newVal){
      //  // 2. 通过数组的 find() 方法，找到购物车按钮的配置对象
      //   const findRes = this.options.find(x => x.text === '购物车')
      //    // 3. 动态为购物车按钮的 info 属性赋值
      //   findRes.info = newVal
      // }
      total:{
        //handler属性用来自定义侦听器的处理函数
        handler(newVal){
          const findRes = this.options.find(x => x.text === '购物车')
          findRes.info = newVal
        },
        //immediate用来声明此侦听器是否在页面初次加载完毕后立即调用
        immediate: true
      }
    },
    data() {
      return {
        // 商品详情对象
        goods_info:{},
        goods_id: '',
        options: [ {
                    icon: 'shop',
                    text: '店铺',
                    infoBackgroundColor:'#007aff',
                    infoColor:"red"
                }, {
                    icon: 'cart',
                    text: '购物车',
                    info: 0
                }],
                buttonGroup: [{
                  text: '加入购物车',
                  backgroundColor: '#ff0000',
                  color: '#fff'
                },
                {
                  text: '立即购买',
                  backgroundColor: '#ffa200',
                  color: '#fff'
                }
                ]
      };
    },
    onLoad(options){
      this.goods_id = Number(options.goods_id)
      this.getGoodsDetail()
    },
    methods:{
      ...mapMutations('m_cart',['addToCart']),
      async getGoodsDetail(){
        var params = {goods_id:this.goods_id}
        const {data: res} = await uni.$http.get('/api/public/v1/goods/detail',params)
        if(res.meta.status !== 200) return uni.$showMsg()
        res.message.goods_introduce = res.message.goods_introduce.replace(/<img /g, '<img style="display: block;"').replace(/webp/g,'jpg')
        this.goods_info = res.message
      },
      preview(i){
        uni.previewImage({
          current: i,
          urls: this.goods_info.pics.map(x => x.pics_big)
        })
      },
      onClick(e){
        if(e.content.text==="购物车"){
          uni.switchTab({
            url: '/pages/cart/cart'
          })
        }
      },
      buttonClick(e){
        if(e.content.text==="加入购物车"){
          //组织一个商品信息对象
          const goods = {
            goods_id: this.goods_info.goods_id, //商品id
            goods_name: this.goods_info.goods_name, //商品名称
            goods_price: this.goods_info.goods_price, //商品价格
            goods_small_logo: this.goods_info.goods_small_logo, // 商品的图片
            goods_count: 1,                           //商品数量
            goods_state: true                        //商品的勾选状态
          }
          //通过store中的cart模块的addToCart方法把商品信息对象存储到购物车中
          this.addToCart(goods)
          //将已有cart数组中的商品信息和这个页面的商品信息对比,有的话将里面的cart_count赋值给options的购物车的info
          //自己实现的购物车方法
          // const findRes = this.cart.find(item=>item.goods_id===this.goods_id)
          // this.options[1].info = findRes.goods_count
        }
      }
    }
  }
</script>

<style lang="scss">
swiper{
  height: 750rpx;
  image{
    width: 100%;
    height: 100%;
  }
}
.goods-info-box{
  padding: 10px;
  padding-right: 0px;
  .price{
    color: #C00000;
    font-size: 18px;
    margin: 10px 0;
  }
  .goods-info-body{
    display: flex;
    justify-content: space-between;
    .goods-name{
      font-size: 13px;
      margin-right: 10px;
    }
    .favi{
      width: 120px;
      font-size: 12px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      border-left: 1px solid #efefef;
      color: gray
    }
  }
  .yf{
    font-size: 12px;
    color: gray;
    margin: 10px 0;
  }
}
.goods_nav{
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
}
.goods-detail-container{
  padding-bottom: 50px
}
</style>
